Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Jul-Aug, 2018@en

Sea ice surface roughness data were obtained during the IceBird Summer campaign in Jul-Aug, 2018 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by an Airplane (Basler BT-67, Polar-6). A method developed by Hibler (1972) was used to a) isolate the surface profile from low-frequency variations associated with the aircraft motion and b) to identify pressure ridge sails. The processing steps are described in https://epic.awi.de/id/eprint/56364/. We applied a ridge detection threshold of 0.6 m, which means that only sails higher 0.6 m are detected. Version and name of the processing routine: Laser_Altimeter_Processing_VS5_06_20.py (vers.5, Feb 22, 2024, https://gitlab.awi.de/sitem/sbla_processing.git). SBLA records (ASTECH - LDM) are provided at a sampling rate of 100 Hz. Sensor accuracy is 2 cm with a beam diameter at surface of 6.3 cm. This dataset includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 6.3 cm .

海冰表面粗糙度数据采集于2018年7—8月开展的IceBird夏季科考航次，搭载于机载电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）由巴斯勒BT-67型极地6号飞机（Basler BT-67, Polar-6）拖曳，飞行高度为海面上方10~30米。本研究采用Hibler（1972）提出的方法完成两项处理任务：a）从与飞行器运动相关的低频分量中分离得到表面剖面；b）识别海冰压力脊帆部结构。数据处理步骤详见https://epic.awi.de/id/eprint/56364/。
我们设置了0.6米的冰脊检测阈值，即仅能识别高度高于0.6米的冰脊帆部结构。处理程序的版本与名称：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，https://gitlab.awi.de/sitem/sbla_processing.git）。
单波束激光高度计的记录数据（ASTECH - LDM）采样率为100赫兹。传感器精度为2厘米，地表波束光斑直径为6.3厘米。本数据集包含记录的高度计读数、衍生的表面高程数据，以及检测到的冰脊帆部结构的宽度、高度和间距。
数据质量说明：6.3厘米。